I'm trying to understand the effects of scoped addressing and have
some difficulty of deciding how system should work on following
situation:

   if it is possible to specify listening socket with ANY address, but
   somehow limited to specific scope (for example, site local scope
   with identifier = X)

then the action is clear, if incoming packet has site local
destination (of the host). The incoming destination scope must by X.

However, I'm not quite sure how I should deal with other
incoming destionations: link local or global scope packets. Should I

a) match them with site scope listen, if the originating interface
   belongs to site scope = X?

b) only accept strictly destination with site scope addresses, even if
   they enter system from interface that has site scope = X?



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